/* ***** BEGIN LICENSE BLOCK *****
 * Distributed under the BSD license:
 *
 * Copyright (c) 2015-2016, xuewen.chu
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of xuewen.chu nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL xuewen.chu BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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 * ***** END LICENSE BLOCK ***** */

var fs = require('fs');

function check_file_is_change(inputs, outputs) {
	var last_ctime = 0;
	
	inputs.forEach(function(input) {
		var ctime = fs.statSync(input).ctime;
		if ( ctime > last_ctime ) {
			last_ctime = ctime;
		}
	});

	for ( var i = 0; i < outputs.length; i++ ) {
		if ( fs.existsSync(outputs[i]) ) {
			var ctime = fs.statSync(outputs[i]).ctime;
			if ( ctime < last_ctime ) {
				return true;
			}
		} else {
			return true;
		}
	}
	return false;
}

exports.check_file_is_change = check_file_is_change;